Learning Forum

[javat33489]

Hi everyone, I'm striking a rigid wall. LS-Dyna Workbench.
The impact is on the bolts. The bolt and nut have bonded contact. But when the impact occurs, the bolt slips through the nut.

I'm also getting penetration messages:

23098 initial penetrations were found for interface        763
     57 initial penetrations were found for interface        646
     70 initial penetrations were found for interface        649
     78 initial penetrations were found for interface        652
     32 initial penetrations were found for interface        655
      62 initial penetrations were found for interface        847
     27 initial penetrations were found for interface        658
   14564 initial penetrations were found for interface        712
      60 initial penetrations were found for interface        850
      50 initial penetrations were found for interface        865
      60 initial penetrations were found for interface        880
   11442 initial penetrations were found for interface        730
      60 initial penetrations were found for interface        841
   14557 initial penetrations were found for interface        718
      60 initial penetrations were found for interface        844
      48 initial penetrations were found for interface        859
   14514 initial penetrations were found for interface        724
      48 initial penetrations were found for interface        862
   14504 initial penetrations were found for interface        706
    122 initial penetrations were found for interface        673
     741 initial penetrations were found for interface        823
    107 initial penetrations were found for interface        676
     551 initial penetrations were found for interface        838

Help please.

[Raman Babu]

Hello Javat,

There may be a gap or initial penetration between the contacting bodies, which could be contributing to bonded contact issue.

Please use the MPC formulation for bonded contacts instead of the programmed control or penalty-based formulation, as it provides a prope constraint definition.

Regarding the initial penetration, kindly review your model carefully and check for any such issues. A small amount of penetration may be acceptable; however, if it is significant, it should be corrected by modifying the geometry.

Regards,

Raman Babu